asp.net问题请教

jackyrong 2003-10-19 08:32:26
我的程序是在分页显示记录时,可以在每条记录有个DEL的按钮,按后可以确认删除,问题是如果当前页(比如第二页只有一条记录,那么删除后,因为该页没记录了,出错,
那么应该如何改正?
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
myConnection = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["ConnString"]);
if (!IsPostBack)
BindGrid();
}
public void BindGrid()
{
string strSql ="SELECT * FROM kejiana ";
SqlDataAdapter myCommand = new SqlDataAdapter(strSql, myConnection);
DataSet ds = new DataSet();
myCommand.Fill(ds, "kejiana");
MyDataGrid.DataSource=ds.Tables["kejiana"].DefaultView;
MyDataGrid.DataBind();
ShowStatsPage();
}
private void PagerButtonClick(object sender, System.EventArgs e)
{
//获得LinkButton的参数值
String arg = ((LinkButton)sender).CommandArgument;
switch(arg)
{
case ("next"):
if (MyDataGrid.CurrentPageIndex <(MyDataGrid.PageCount - 1))
MyDataGrid.CurrentPageIndex ++;
break;
case ("prev"):
if (MyDataGrid.CurrentPageIndex> 0)
MyDataGrid.CurrentPageIndex --;
break;
case ("fist"):
MyDataGrid.CurrentPageIndex=0;
break;
case ("last"):
MyDataGrid.CurrentPageIndex = (MyDataGrid.PageCount - 1);
break;
default:
//本页值
MyDataGrid.CurrentPageIndex = Convert.ToInt32(arg);
break;
}
BindGrid();
}

void ShowStatsPage()
{
//显示页面信息
lblCurrentIndex.Text = "当前为第:" + ((int)MyDataGrid.CurrentPageIndex+1) + "页";
lblPageCount.Text = "共:" + MyDataGrid.PageCount + "页";
}



private void MyDataGrid_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
{
//处理按下数字的方法
MyDataGrid.CurrentPageIndex = e.NewPageIndex;
BindGrid();
}



private void btnGo_Click(object sender, System.EventArgs e)
{
//页面直接跳转的代码
if(txtGoPage.Text.Trim()!="")
{
int PageI=Int32.Parse(txtGoPage.Text.Trim())-1;
if (PageI>=0 && PageI< (MyDataGrid.PageCount))
MyDataGrid.CurrentPageIndex = PageI ;
BindGrid();
}

}


#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.btnFirst.Click += new System.EventHandler(this.btnFirst_Click);
this.btnPrev.Click += new System.EventHandler(this.btnPrev_Click);
this.btnNext.Click += new System.EventHandler(this.btnNext_Click);
this.btnLast.Click += new System.EventHandler(this.btnLast_Click);
this.btnGo.Click += new System.EventHandler(this.btnGo_Click);
this.MyDataGrid.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.MyDataGrid_ItemCommand);
this.MyDataGrid.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.MyDataGrid_ItemDataBound);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void btnNext_Click(object sender, System.EventArgs e)
{
if (MyDataGrid.CurrentPageIndex <(MyDataGrid.PageCount - 1))
MyDataGrid.CurrentPageIndex ++;
BindGrid();
}

private void btnPrev_Click(object sender, System.EventArgs e)
{
if (MyDataGrid.CurrentPageIndex> 0)
MyDataGrid.CurrentPageIndex --;
BindGrid();
}

private void btnFirst_Click(object sender, System.EventArgs e)
{
MyDataGrid.CurrentPageIndex=0;
BindGrid();
}

private void btnLast_Click(object sender, System.EventArgs e)
{
MyDataGrid.CurrentPageIndex = (MyDataGrid.PageCount - 1);
BindGrid();
}

private void MyDataGrid_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
if(e.CommandName == "Delete")
{
this.DeleteRow(this.MyDataGrid.DataKeys[e.Item.ItemIndex].ToString());
MyDataGrid.CurrentPageIndex=0;
BindGrid();
}
}

private void MyDataGrid_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
switch(e.Item.ItemType)
{
case ListItemType.Item:
case ListItemType.AlternatingItem:
case ListItemType.EditItem:
{
Button btn = (Button)e.Item.FindControl("btnDelete");
btn.Attributes.Add("onclick", "return confirm('你是否确定删除这条记录');");
break;
}
}
}
private void DeleteRow(string i)
{

SqlConnection myConnection = new SqlConnection("server=localhost;uid=sa;database=kejiana");
SqlCommand cmd = new SqlCommand("DELETE FROM kejiana WHERE kid = "+i,myConnection);
myConnection.Open();
cmd.ExecuteNonQuery();
myConnection.Close();
}
}
...全文
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孟子E章 2003-10-19
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nezha 2003-10-19
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是有此问题,按说此控件应能自动计算处此错误然后将当前页前移一页,很不幸,他们不管。

BindGrid()中须判断,MyDataGrid.CurrentPageIndex 是否大于MyDataGrid.pagecount-1 再写代码处理。

if MyDataGrid.CurrentPageIndex > MyDataGrid.pagecount-1

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